[Bug 4678] Switch to Google Maps V3 (initial patch by Judith Haffner)

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/realty/trunk@81086 735d13b6-9817-0410-8766-e36946ffe9aa
Bump the version number to 0.5.70.

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/realty/trunk@81087 735d13b6-9817-0410-8766-e36946ffe9aa